A couple of questions for you:
a) How is the hand feel of the phone? I have smaller hands, and my HTC M8 is about as big as I want to go, so with that in mind does it feel "big" after much use?
b) The signal issue: real or not? Low bars compared to other phones? Any observations yet?
c) Heat: I have read some complaints of overheating. I have never had my HTC M8 get hot on me other than once while using the car charger. But then again I don't watch videos, or play games on my phone. I use it for calls, texts, email, Android Central, and some web surfing.
d) Does it scream for a case to keep it safe? I break out into a sweat anytime my wife or daughters take their iPhones out of the otterboxes/UAG cases since they have fumble fingers. My wife zorched her iPhone 5 through a combination of drops (in the case), and baking it to death at the beach in Corpus Christi. Same for a tempered glass screen protector.
e) Wifi: does it work well on the 2.4/5 ghz bands?
f) Do you have to use Hangouts as your SMS/MMS client, or are there options?
g) Is it as easy as my HTC to set up email (Yahoo, Gmail, etc) since I use multiple services.
h) How is the screen in sunlight? As I get older (WAAAH!) I have some trouble with the screens in bright Texas sunlight.
i) How does the AC app work

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Thank you for your reply to my question on bluetooth.